Go and get better again (6)
I believe the answer is:
repair
I believe this clue is a double definition.
'go' is the first definition.
(I've seen this before)
'get better again' is the second definition.
(repair can mean to make better again)
'and' acts as a link.
(Other definitions for repair that I've seen before include "Mend - go" , "Get back into good shape" , "Proceed - restore" , "Restore after damage" , "Restore (something) to good condition" .)